import { computed, onBeforeMount } from 'vue'
import { getLightColor, getDarkColor } from './tool'
import { ConfigStore } from '@/stores/modules/config'

/**
 * @description 切换主题
 * */
export const useTheme = () => {
  const configStore = ConfigStore()
  const themeConfig = computed(() => configStore.themeConfig)

  // 切换暗黑模式
  const switchDark = () => {
    const body = document.documentElement as HTMLElement
    if (themeConfig.value.isDark) body.setAttribute('class', 'dark')
    else body.setAttribute('class', '')
  }

  // 修改主题颜色
  const changePrimary = (val: string) => {
    if (!val) {
      // ElMessage({ type: 'error', message: `主题颜色设置错误` });
      return
    }
    configStore.setThemeConfig({ ...themeConfig.value, primary: val })
    // 颜色加深
    document.documentElement.style.setProperty(
      '--el-color-primary-dark-2',
      `${getDarkColor(themeConfig.value.primary, 0.1)}`,
    )
    document.documentElement.style.setProperty('--el-color-primary', themeConfig.value.primary)
    // 颜色变浅
    for (let i = 1; i <= 9; i++) {
      document.documentElement.style.setProperty(
        `--el-color-primary-light-${i}`,
        `${getLightColor(themeConfig.value.primary, i / 10)}`,
      )
    }
  }

  // 灰色和弱色切换
  const changeGreyOrWeak = (value: boolean, type: string) => {
    const body = document.body as HTMLElement
    if (!value) return body.setAttribute('style', '')
    if (type === 'grey') body.setAttribute('style', 'filter: grayscale(1)')
    if (type === 'weak') body.setAttribute('style', 'filter: invert(80%)')
    const propName = type == 'grey' ? 'isWeak' : 'isGrey'
    configStore.setThemeConfig({ ...themeConfig.value, [propName]: false })
  }

  onBeforeMount(() => {
    switchDark()
    changePrimary(themeConfig.value.primary)
    if (themeConfig.value.isGrey) changeGreyOrWeak(true, 'grey')
    if (themeConfig.value.isWeak) changeGreyOrWeak(true, 'weak')
  })

  return {
    switchDark,
    changePrimary,
    changeGreyOrWeak,
  }
}
